Hello Volker,
First may I add my congratulations on your two-seater pilot status!

Running my tally up answering your questions is tempting...but I might run out of steam!
The book I always go to first regarding medals is *"Ribbons and Medals: Naval, Military, Air Force and Civil"
by Captain H. Taprell Dorling, DSO, RN ("Taffrail) in association with L.F. Guille. *My copy is one reprinted in 1970 by George Philip and Son, Limited, London with an SBN (pre-dating ISBN?) of 540 00192 9
I believe it is now out of print, but a quick look at some on-line bookstores has turned up a few second hand copies, various editions and prices.
This book is strongest on British orders etc, but also covers at least the major decorations of most other countries. *Very good on the various classes of orders, dates instituted, qualifications for receiving the award etc. Lots of illustrations, colour ones of ribbons especially. No lists of recipients though.
For more detail on strictly US awards I have "American Medals and Decorations" by Evans E. Kerrigan my copy published 1990 by Medallic Publishing Company, Noroton Heights, Connecticut, USA.
ISBN 0-9624663-4-4
There is also a magazine published in the UK called "Medal News" which could be useful. Their website is
http://www.tokenpublishing.co.uk
Not a lot of information on the website itself, more a taster to tempt you to subscribe to the magazine.
One online bookstore I have yet to check, which may come good, is The Naval and Military Press.
Website is *
http://www.naval-military-press.co.uk
AmazonUK had a few Dorling's listed in their zShops section. I think amazon has a German site as well.
If I think of anything else, or turn up anything online (per your original question) I will let you know. Meantime, good luck book hunting!
Regards, Liz